The summer concert season officially kicks off this weekend — and Rolling Stone has the insider's guide to the biggest and best tours. Lady Gaga will bring the pop spectacle (plus a 40-foot-long sea monster), Green Day will unleash pyro and a 15-year catalog of hits, Phish are set to unveil new songs, and Tom Petty will get his 'Mojo' working with the Heartbreakers. Click through to get a lowdown on these 48 tours — including LCD Soundsystem and Crosby, Stills and Nash — plus a definitive guide to the season's hottest festivals.